Freeze-thaw cycles simultaneously decrease peatland photosynthetic carbon uptake and ecosystem respiration
Decreasing snow cover in winter resulting from climate warming increases the incidence of freeze–thaw cycles (FTCs) in many ecosystems, including peatlands. As peatland ecosystems form a globally significant long-term carbon storage, understanding the effects of changing conditions in winter on carb...
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ftsouthampton:oai:eprints.soton.ac.uk:411953 2023-07-30T04:02:43+02:00 Freeze-thaw cycles simultaneously decrease peatland photosynthetic carbon uptake and ecosystem respiration Küttim, Martin Hofsommer, Maaike L. Robroek, Bjorn J.M. Signarbieux, Constant Jassey, Vincent E.J. Laine, Anna M. Lamentowicz, Mariusz Buttler, Alexandre Ilomets, Mati Mills, Robert T.E. 2017-05-29 text https://eprints.soton.ac.uk/411953/ https://eprints.soton.ac.uk/411953/1/2017_Kuttim_et_al_Bor_Env_Res.pdf en English eng https://eprints.soton.ac.uk/411953/1/2017_Kuttim_et_al_Bor_Env_Res.pdf Küttim, Martin, Hofsommer, Maaike L., Robroek, Bjorn J.M., Signarbieux, Constant, Jassey, Vincent E.J., Laine, Anna M., Lamentowicz, Mariusz, Buttler, Alexandre, Ilomets, Mati and Mills, Robert T.E. (2017) Freeze-thaw cycles simultaneously decrease peatland photosynthetic carbon uptake and ecosystem respiration. Boreal Environment Research, 22, 267-276. Article PeerReviewed 2017 ftsouthampton 2023-07-09T22:16:10Z Decreasing snow cover in winter resulting from climate warming increases the incidence of freeze–thaw cycles (FTCs) in many ecosystems, including peatlands. As peatland ecosystems form a globally significant long-term carbon storage, understanding the effects of changing conditions in winter on carbon dynamics is essential. We studied how FTCs affect peatland carbon cycling by conducting mesocosm experiments with Sphagnum. Our results indicate an overall impeding effect of FTCs on Sphagnum photosynthesis, chlorophyll content, ecosystem respiration and enzymatic processes. A threefold reduction in photosynthesis in the FTC treatment was related to a decrease in chlorophyll content, showing that Sphagnum physiologically suffers from repeated FTCs. In the FTC treatment β-glucosidase and phosphatase enzymatic activities decreased by 50% and 30%, respectively, whilst alanine remained unaffected, indicating that in peat soils short-term FTCs affect the carbon and phosphorus cycles, but not the nitrogen cycle. Long-term effects of FTCs deserve further studies. Article in Journal/Newspaper Boreal Environment Research University of Southampton: e-Prints Soton |
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Open Polar |
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University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
Decreasing snow cover in winter resulting from climate warming increases the incidence of freeze–thaw cycles (FTCs) in many ecosystems, including peatlands. As peatland ecosystems form a globally significant long-term carbon storage, understanding the effects of changing conditions in winter on carbon dynamics is essential. We studied how FTCs affect peatland carbon cycling by conducting mesocosm experiments with Sphagnum. Our results indicate an overall impeding effect of FTCs on Sphagnum photosynthesis, chlorophyll content, ecosystem respiration and enzymatic processes. A threefold reduction in photosynthesis in the FTC treatment was related to a decrease in chlorophyll content, showing that Sphagnum physiologically suffers from repeated FTCs. In the FTC treatment β-glucosidase and phosphatase enzymatic activities decreased by 50% and 30%, respectively, whilst alanine remained unaffected, indicating that in peat soils short-term FTCs affect the carbon and phosphorus cycles, but not the nitrogen cycle. Long-term effects of FTCs deserve further studies. |
format |
Article in Journal/Newspaper |
author |
Küttim, Martin Hofsommer, Maaike L. Robroek, Bjorn J.M. Signarbieux, Constant Jassey, Vincent E.J. Laine, Anna M. Lamentowicz, Mariusz Buttler, Alexandre Ilomets, Mati Mills, Robert T.E. |
spellingShingle |
Küttim, Martin Hofsommer, Maaike L. Robroek, Bjorn J.M. Signarbieux, Constant Jassey, Vincent E.J. Laine, Anna M. Lamentowicz, Mariusz Buttler, Alexandre Ilomets, Mati Mills, Robert T.E. Freeze-thaw cycles simultaneously decrease peatland photosynthetic carbon uptake and ecosystem respiration |
author_facet |
Küttim, Martin Hofsommer, Maaike L. Robroek, Bjorn J.M. Signarbieux, Constant Jassey, Vincent E.J. Laine, Anna M. Lamentowicz, Mariusz Buttler, Alexandre Ilomets, Mati Mills, Robert T.E. |
author_sort |
Küttim, Martin |
title |
Freeze-thaw cycles simultaneously decrease peatland photosynthetic carbon uptake and ecosystem respiration |
title_short |
Freeze-thaw cycles simultaneously decrease peatland photosynthetic carbon uptake and ecosystem respiration |
title_full |
Freeze-thaw cycles simultaneously decrease peatland photosynthetic carbon uptake and ecosystem respiration |
title_fullStr |
Freeze-thaw cycles simultaneously decrease peatland photosynthetic carbon uptake and ecosystem respiration |
title_full_unstemmed |
Freeze-thaw cycles simultaneously decrease peatland photosynthetic carbon uptake and ecosystem respiration |
title_sort |
freeze-thaw cycles simultaneously decrease peatland photosynthetic carbon uptake and ecosystem respiration |
publishDate |
2017 |
url |
https://eprints.soton.ac.uk/411953/ https://eprints.soton.ac.uk/411953/1/2017_Kuttim_et_al_Bor_Env_Res.pdf |
genre |
Boreal Environment Research |
genre_facet |
Boreal Environment Research |
op_relation |
https://eprints.soton.ac.uk/411953/1/2017_Kuttim_et_al_Bor_Env_Res.pdf Küttim, Martin, Hofsommer, Maaike L., Robroek, Bjorn J.M., Signarbieux, Constant, Jassey, Vincent E.J., Laine, Anna M., Lamentowicz, Mariusz, Buttler, Alexandre, Ilomets, Mati and Mills, Robert T.E. (2017) Freeze-thaw cycles simultaneously decrease peatland photosynthetic carbon uptake and ecosystem respiration. Boreal Environment Research, 22, 267-276. |
_version_ |
1772813539997646848 |